''Eriogonum cedrorum'' is a rare species of wild buckwheat known by the common name The Cedars buckwheat. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found els ...

Sonoma County, California Sonoma County () is a county (United States), county located in the U.S. state of California. As of the 2020 United States Census, its population was 488,863. Its county seat and largest city is Santa Rosa, California, Santa Rosa. It is to the n ...

where it is known only from The Cedars, an unincorporated area outside of

Guerneville Guerneville ( , ) is an unincorporated community and census-designated place in the Russian River Valley of Sonoma County, California, United States. The town is historically known for the logging community, formed in the late 1800s. Guerneville ...

near Cazadero.

Distribution

The Cedars is known for its botanical riches, including the endemic plant species Cedars fairy lantern and serpentine fleabane.Raiche, R. (2009)
The Cedars: Sonoma County's Hidden Treasure.
''Fremontia'' 37:2 3. The habitat is a serpentine canyon surrounded by non-serpentine terrain and many rare serpentine-endemic plants are isolated within. Much of the flora is also adapted to alkaline conditions, growing among

seep A seep or flush is a moist or wet place where water, usually groundwater, reaches the earth's surface from an underground aquifer. Description Seeps are usually not of sufficient volume to be flowing beyond their immediate above-ground location. ...

s of mineral-rich waters that can have a pH up to 11. This species of buckwheat was first collected in 1947 and described to science as a new species in 2009.Reveal, J. L. and R. Raiche. (2009)
''Eriogonum cedrorum'' (Polygonaceae: Eriogonoideae), a new species from northwestern California.
''J Bot Res Inst Texas'' 3:2 479-83. It can be found in three locations with an estimated 1500 to 2000 individuals in existence.The Nature Conservancy
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Description

''Eriogonum cedrorum'' is a mat-forming perennial herb growing up to half a meter wide with hairy or woolly herbage. It has a woody

taproot A taproot is a large, central, and dominant root from which other roots sprout laterally. Typically a taproot is somewhat straight and very thick, is tapering in shape, and grows directly downward. In some plants, such as the carrot, the taproo ...

and

caudex A caudex (plural: caudices) of a plant is a Plant stem, stem, but the term is also used to mean a rootstock and particularly a basal stem structure from which new growth arises.pages 456 and 695 In the strict sense of the term, meaning a stem, " ...

unit covered in rosettes of leaves each up to 1.5 centimeters long by 1 wide. The

inflorescence An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are formed ...

arises on an erect stem up to 8 centimeters. The inflorescence itself is a cluster of yellow flowers that quickly turn dark red. The

stamen The stamen (plural ''stamina'' or ''stamens'') is the pollen-producing reproductive organ of a flower. Collectively the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filam ...

s are tipped with yellow anthers.

References

External links

Jepson Manual Treatment - ''Eriogonum cedrorum''
{{Taxonbar, from=Q5389351

cedrorum ''Cedrorum azoricus'' is a species of beetle in the family Carabidae, the only species in the genus ''Cedrorum''. It is native to the Azores archipelago. References Pterostichinae Endemic arthropods of the Azores Beetles described in ...

Endemic flora of California Endemic flora of the San Francisco Bay Area Natural history of Sonoma County, California Plants described in 2009 Critically endangered flora of California